Auxiliary feed device for sewing machines



Sept. 27,1932. .1 T. DOWDALL 1,88%,016

AUXILIARY FEED DEVICE FOR SEWING MACHINES Filed Aug. 1, 1951 2Sheets-$heet l Sept. 27, 1932. T, DOWDALL 1,880,016

AUXILIARY FEED DEVICE FOR SEWTNG MACHINES Filed Aug. 1. 1931 2Sheets-Sheet 2 r F UVVENTOR BY fi tt v ATTOR 15y Patented Sept. 27, 1932I UNITED STATES JAMES T. DOWDALL, 01E OZON E PARK, NEW YORK, ASSIGNOROF" ONE-HALF TO JOHN T.

KEVENEY, OF BROOKLYN, NEW YORK l rarsnr err-ice AUXILIARY FEED DEVICEFOR SE WING MACHINES Application filed August 1, 1921. Serial No.554,396.

This invention relates to sewing machines and more particularlyto thefeeding mechanism therefor, and has for one of itsobjects the provisionof an auxiliary feeding device which will insure simultaneous, equal,and positive feed of all superposed layers of material that are beingsewn together.

1 'Another, object of'the invention is to pro vide aniauxiliary materialfeeding device for sewing machines that is directly carried: by theusualfeeding mechanism, so that it may move therewith in proper timingrelation and be actuated for passing the material against the toothedfeed bar when said bar is raised into feeding position. v V

A further object of the invention is to provide" a device of this naturethat may be attached to the material feeding device of any sewingmachine without materially changing the said machine.

Still another object of the invention is to provide a device of thecharacter described that may readily be detached from the machine andone that will not interfere with the normal operation of the saidmachine when left attached thereto.

Another object is to produce a device of the character described inwhich the maximum simplicity of construction and operation is' secured.7

Other objects and advantages will appear as the nature of theimprovements is better understood, the invention consistingsubstantially in the novel arrangement and co-relation of parts hereinfully described, and illustrated in the accompanying drawings, whereinsimilar reference characters are used to describe corresponding partsthroughout the several views, and then finally pointed out andspecifically defined and indicated in the appended claims.

The disclosure made the basis of eXemplifying the present inventiveconcept suggests a practical embodiment thereof, but the invention isnot to be restricted to the exact details of this disclosure, and thelatter, therefore, is to be understood from an illustrative, rather thana restrictive standpoint.

The inventive idea involved is capable of receiving a variety ofmechanical expressions,

one of which, for the purpose of illustration, is shown in theaccompanying drawings, in which I Figure 1 is a sectional view throughthe feeding mechanism of a sewing machine showing my invention asapplied thereto.-

Figure 2 is anrend view thereof partly in section, looking from the leftof Fig. 1.

Fig. 3, is a top planview of the device withthe needle plate partlybroken away for the sake of clearness.

Fig. s is a detail view in perspective of the material gripping ,plateand Fig. 5 is a similar view of the plate carrier.

It is a well known fact that when sewing through two or moreplies ofmaterial bya sewing machine, the lowermost ply becomes gathered, due tothe fact that it is in direct contact with the feed bar of the machineand. is positively fed thereby, while the upper ply. contacts with thepresser'foot which so far as feeding is concerned is relativelystationary, thereby slightly retarding the feeding of the said upper plyand causing a relative slippage or a relatively difierent rate offeeding speed or travel of the said ,pli esr In order to obviate'thisundesirable feature I have provided a gripper armthat travels with thefeeding bar thereby eliminating any possible slippage between the saidplies. I Referring now to the drawings in detail indicates the frame ofa sewing machine in which there is rotatably mounted: a drive shaft 11connected to the usual driving mechanism or source of power not shown.

vThe said shaft 11. carries the sewing hook 12 and eccentrics 13 and 14.Pivotally mounted at 15 is a cradle 16 in which there is pivotallymounted bifurcated lever'17, the fork portion 18 thereof straddling theeccentric 18. The material feeding bar 20 is secured to the said lever1'7 by means ofa screw 21. A sec tive and elevatable feed bar, apivotally" mounted gripping plate in operative engageof a-screw 41 tothe top surface of the needle plate 42. This strap extends over the topof the bracket 33 as shown in Figs. 1, 2 and 3. The needle plate 42'isprovided with a cutout 43 through which the carrier block 31 extends anda second cutout 44 in which the feed bar 20 is guided r I; The presserfoot- 45 is provided with a cutout 46 to accommodate the gripping finger34 as well as'the needle 47 carried by the needlebar' 48. r

In the type of sewing machine illustrated the eccentric 13 raises thelever 17 together with the feedbar 20, and the eccentric 14 actuates thelever 22 to swing the said lever 17 and the feed bar to and fro :forfeeding purposes. I

It will therefore be seen that each time that the lever 17 and feed bar20 is raised the carrier block 31 and the plate 33 will be raisedtherewith and that during this action the strap or bracket 40 will causethe said plate 33 to swing downwardly at the finger end and grip orpress .thematerial against the feed bar 20 and as the carrier block andplate travel with the feed bar'20 no slippage is possible between any ofthe material plies. The resili'ancy of the finger 34 will "compensatefor any variations in the thickness of the materials sewn. V i

' From the foregoing it will be seen that I have provided a simple andefiicient auxiliary feed for sewing machines thatwill insure evenness inappearance of two or more plies of material sewn by the said machine bypositively and simultaneously feeding all of the said plies at a uniformrate of speed.

Having described my invention what I claim as new and desire to secureby Letters Patent is: Y 1. An auxiliary material feed mechanism forsewing machines comprising a reciprocative and elevatable support, aplate pivotally mounted thereon, a finger on the said plate, a stopengaging the said plate, and spring means for maintaining the plateagainst the stop.

2; In a sewing machine having a reciprocament with thesaid feed bar, astop for the said plate and a spring to maintainthe: said plate inengagement'with the saidstop.

3. In a sewing machine having a'reciprocaally mounted on the carrier, astop in operative engagement with the plate, a finger on the plate inoperative relation to the feed bar and a spring exerting a tension onthe plate for the purpose specified.

In a sewing machine, a movable lever, a feed bar carried thereby, apivotally mounted gripping member on the lever and in operativeengagement with the feed bar, a spring for the said gripping member,means for raising and reciprocating the lever and feed bar and a stop inengagement with the gripping member for deflecting same when the leverand feed bar are raised.

5. In a sewing machine, a movable feed bar, a pivotally mounted grippingmember operatively connected to the feed bar tomove iliary feedtherefor,-comprising a pivotally' mounted and depressible gripperarranged to' movewith the said feeding mechanism, and

a stop to deflect the said gripper to grip the material when'it is beingfed. i In testimony whereof Ihereunto afiix my- J ES-T. DOWDALL."

signature.

tive and liftable lever, a material feeding-bar I thereon, a carrier onthe lever, a plate pivot-

